Shield stone



FIG. 1 is a top plan view of a shield stone showing our new design;

FIG. 2 a bottom plan view;

FIG. 3 is a right side plan view;

FIG. 4 is a left side plan view;

FIG. 5 is a front plan view looking FROM the point as shown on the bottom of FIG. 1; and,

FIG. 6 is a rear side plan view looking toward the point on the top as shown in FIG. 1.

The portions of the shield stone shown in dotted lines in the Figures are for environmental purposes only and form no part of the claimed design. 

The ornamental design for a shield stone, as shown and described. 